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아세토니트릴 용매 중에서 Copper-1,5,9,13-Tetrathiacyclohexadecane 착물의 전기화학적 거동과 그 분석적 응용
徐戊龍,李富永,崔明子,裵俊雄,朴泰明 慶尙大學校 기초과학연구소 1992 基礎科學硏究所報 Vol.8 No.-
비수용매인 아세토니트릴 중에서 Cu(Ⅱ)dhk 1,5,9,13-tetrathiacyclohexadecane[16-ane-S_4]의 착물에 대한 전기화학적 거동으로서 직류폴라로그램과 미분펄스폴라로그램으로부터 환원전류의 유형과 가역성을 조사하고, 이들 화합물의 분석적 응용으로서 수용액에 있는 Cu(Ⅱ) 이온을 염석추출법으로 정량하였다. 또한 아세토니트릴 용매 중에서 착물의 안정도상수를 구하고, 분석적 응용으로 수용액 중의 Cu(Ⅱ)를 염석추출법으로 정량하기 위하여 추출 조건 곧 킬레이트와 염석제의 효과, pH 범위를 구하고 또한 Cu(Ⅱ)이온을 정량하는데 있어서의 검량성과 공존이온 효과를 조사하였다. 실험결과로부터 환원 과정은 비가역적이었으며 환원전류는 확산지배적임을 알았다. 또한 아세토닐트릴 용매 중에서 착물의 log K_f 값은 3.51이었으며 Cu(Ⅱ) 이온을 정량하는데 있어서 공존하는 이온의 영향을 별로 받지 않아 선택성이 좋았으며 본 실험방법에 의한 정량한계는 60ppb 이었다. The electrochemical behaviors and analytical application of copper-1,5,9,13-tetrathiacyc-lohexadecane[16-ane-S_4] complex in acetonitrile(AN) solution have been investigated by the use of Dc polarogaphy and differential pulse polarography. Thus the formation constant of copper complex was 10^3.51. Copper (Ⅱ) ion was found to form complex of 1-to-1 composition with [16-ane-S_4]. In addition, reduction step was irreversible and the reduction current was diffusin controlled. And the effect of concentration of the salting-out reagent and chelating agent and pH of aqueous phase on the determination of copper(Ⅱ) was investigated and diverse ion effect was discussed. By salting-out extraction technique, we can be determined until the concentration of cooper (Ⅱ) of 60 ppb.
아세토니트릴 용매 중에 1-(2-Thiazolylazo)-2-naphthol의 전기화학적 거동
서무룡,박태영 慶尙大學校 1990 論文集 Vol.29 No.1
The electrochemical behaviors of l-(2-thiazolylazo)-2-naphthol(TAN) in acetonitrile(AN) solution were studied by cyclic voltammetry, controlled potential coulometry. In order to investigate the type of reducion current at each reduction step, dependence of limiting current on the scan rates and concentration of TAN have been examined. And in order to investigate the reduction mechanism of TAN in AN solution, the effect of proton donor such as water on cyclic voltammogram of TAN and the revrisbillty of each reduction step have been studied. And we measured the number of the electrons involving in each reduction step by controlled potential coulometry. The electrochemical reduction of TAN in AN solution occurs in four one-electron steps. The product of the first and third electron transfer to the dianion is followed by a chemical reaction producing a protonated species which is oxidizable to the parent compound. The product of the fourth electron transfer also produces the corresponding amine compounds.
아세토니트릴 용액속에서 Ni(II)-1-(2-thiazolylazo)-2-naphthol 착물의 전기화학적 환원
서무룡 慶尙大學校 1988 論文集 Vol.27 No.1
반양자성 용매인 아세토니트릴 용액에서 Nickel-1-(2-thiazolylazo)-2-naphthol 착물의 전기화학적 환원을 직류 폴라로그래프법, 일정전위 전기분해법 및 자외선 분광광도법으로 수행하였다. Ni(II)-(TAN)2 착물은 아세토니트릴 용매 속에서 3단계의 환원과정을 거치며 제1단계에서는 비교적 안정한 anion radical 이 생성되는 1전자 환원 단계이며 제2단계에서는 dianion이 생성되는 1전자 환원단계로 생각된다. 그리고 최종 환원생성물은 amine 화합물이 될 것으로 추측된다. 모든 환원단계는 화산지배적이었으며 제1단계의 가역성은 비교적 좋았으나 제2단계의 가역성은 비교적 나쁜편이었다.
1-(-2 Thiazolylazo)-2-naphthol을 킬레이트제로 사용한 Cu(Ⅱ)의 염석추출법적 정량
서무룡,박태명 국립경상대학교 공과대학 부설 첨단소재연구소 1991 尖端素材 Vol.1 No.-
As a part of analytical application of 1-(2-thiazolylazo)-2-naphthol (TAN), the extraction method with salting-out tachnique was employed for the determination of Cu(II) ion acetonitrile-water solution. After the extraction of Cu(II) ion into acetonitrile layer as a Cu(II)-TAN complex from the buffered aqueous solution, the visible absorption spectra and differential polarograms were recorded. In this experiment, ammonium sulfate was used as a salting-out agent. Not only the relationship between pH of aqueous phase and extractabilities of TAN chelate, but also the effect of concentraction of ammonium sulfate and chelating agent(TAN) on extractability have been evaluted. And the calibration curves and diverse ion effect for the determination of Cu(II) ion have been investigated by spectrophotometric and polarographic method.
계면활성제의 친수·소수성 그룹의 부분전하와 CMC 특성 (양이온 및 양쪽성 계면활성제)
하윤식,서무룡 한국환경과학회 2000 한국환경과학회지 Vol.9 No.5
On the basis of theory of Bratsch's electronegativity equalization, the electronegativity equalization, the group electronegativities and the group partial charges for cationic and amphoteric surfactants could be calculated using Pauling's electronegativity parameters. From calculated output, we have investigated relationships between CMC(critical micelle concentration) and partial charge and group electronegativity of hydrophilic and hydrophobic groups, structural stability of micelle for cationic and amphoteric surfactants. As a result, CMC depends upon partial charge and electronegativity of hydrophilic and hydrophobic groups for surfactants. In case of cationic surfactant, as the increment of carbon number in hydrophilic group, partial charge of hydrophilic group is increased, but CMC and electronegativity of hydrophilic group is decreased. With increasing the carbon number of hydrophilic group for cationic surfactant, its partial charge is increased, but CMC and its electronegativity are decreased. With increasing the carbon number of hydrophobic group for cationic and amphoteric surfactant, its partial charge is increased, but CMC and its electronegativity are decreased
Electrochemical Study of Nickel(II) Complexes with Diaza-Macrocyclic Ligands in Acetonitrile
Moo-Lyong Seo,Zun-Ung Bae,Tae-Myoung Park Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.4
The electrochemical behavior and the complex formation between N$i^{2+}$ and 1,7-diazs-15-crown-5 and 1,10-diaza-18-crown-6 in acetonitrile solution have been studied by DC polarography, differential puke polarography and cyclic voltammetry. Nickel(Ⅱ) complexes gave a single well-defined wave. The formation constants of their complexes were 1$0^{4.89} and 10^{3.86}$, respectively. Nickel(Ⅱ) ion was found to form complexes of 1-to-1 composition with 1,7-diaza-15-crown-5 and 1,10-diaza-18-crown-6. In addition, reduction steps were irreversible and the reduction current were diffusion controlled. The electrochemical reduction mechanism of Ni(Ⅱ)-macrocyclic diaza-crown complexes in acetonitrile solution is estimated.